### 引入 平时，在写前端页面时，很有可能会涉及到表单中有日期的情况，一般情况下不同的业务使用的日期格式都有所不同。下面看下一个简单的例子说明SpringMVC对日期的处理。 jsp页面如下（简单的表单，其中有一个输入框中输入的是日期时间）：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<form id="addForm" action="<c:url value='/doAdd'/>" method="POST" >
<input type="text" name="name" value="测试"/>
<input type="text" name="birthtime" value="2017-10-10 10:10"/>
<button type="submit">保存</button>
</form>
</body>
</html>
``
POJO如下：
```java
public class User{
private String name;
private Date birthtime;
// 属性的setter/getter方法略
}
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@Controller
public class TestFileController {
@RequestMapping("/doAdd")
public void doAdd(@ModelAttribute User user, HttpServletRequest request){
System.out.println(user.getName());
System.out.println(user.getBirthtime());
}
}
<div class="se-preview-section-delimiter"></div>
org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors Field error in object ‘user’ on field ‘birthtime’: rejected value [2017-10-10 10:10]; codes [typeMismatch.user.birthtime,typeMismatch.birthtime,typeMismatch.java.util.Date,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [user.birthtime,birthtime]; arguments []; default message [birthtime]]; default message [Failed to convert property value of type ‘java.lang.String’ to required type ‘java.util.Date’ for property ‘birthtime’; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type java.lang.String to type java.util.Date for value ‘2017-10-10 10:10’; nested exception is java.lang.IllegalArgumentException] at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:113) at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:78) at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:162) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:129) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:111) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:806) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:729) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
此异常是什么意思呢？很明显，输入的字符串’2017-10-10 10:10’不能转换为Date类型。所以下面要做的就是把前端的字符串形式的日期转换为java.util.Date类型。
SpringMVC日期处理
处理前端到控制器的日期有两种方式：(当前不止两种了！)
1. 在控制器中使用@InitBind注解
2. 在POJO中日期属性上添加@DateTimeFormat
方式1：在控制器中使用@InitBind注解
@Controller
public class TestFileController {
@InitBinder
public void initBind(WebDataBinder binder){
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");
dateFormat.setLenient(false);
binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
}
@RequestMapping("/doAdd")
public void doAdd(@ModelAttribute User user, HttpServletRequest request){
System.out.println(user.getName());
System.out.println(user.getBirthtime());
}
}
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方式2：在POJO中日期属性上添加@DateTimeFormat
public class User{
private String name;
@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm")
private Date birthtime;
// 属性的setter/getter方法略
}